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2001022221 = 311193191423
BaseRepresentation
bin111011101000101…
…0010110100001101
312011110021110110010
41313101102310031
513044230202341
6530320503433
7100405260012
oct16721226415
95143243403
102001022221
11937585680
1247a17ab79
1325b744723
1414da83709
15baa15716
hex77452d0d

2001022221 has 16 divisors (see below), whose sum is σ = 3063767040. Its totient is φ = 1148911920.

The previous prime is 2001022217. The next prime is 2001022267. The reversal of 2001022221 is 1222201002.

It is not a de Polignac number, because 2001022221 - 22 = 2001022217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001022197 and 2001022206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001022211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1595085 + ... + 1596338.

It is an arithmetic number, because the mean of its divisors is an integer number (191485440).

Almost surely, 22001022221 is an apocalyptic number.

It is an amenable number.

2001022221 is a deficient number, since it is larger than the sum of its proper divisors (1062744819).

2001022221 is a wasteful number, since it uses less digits than its factorization.

2001022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191456.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2001022221 is about 44732.7868682469. The cubic root of 2001022221 is about 1260.1356662941.

Adding to 2001022221 its reverse (1222201002), we get a palindrome (3223223223).

The spelling of 2001022221 in words is "two billion, one million, twenty-two thousand, two hundred twenty-one".

Divisors: 1 3 11 19 33 57 209 627 3191423 9574269 35105653 60637037 105316959 181911111 667007407 2001022221